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You can use the 8X inplace of the 5AX the raster won't fill the screen and the image will be a ~4" circle in the center. In most sets it will be plug and play. Some portables may have lower current and different voltage heater strings which may effect heater performance of the test CRT.
Telematic made an 8X test jig I (and others) have that consisted of the test CRT a test yoke with long alligator clips with inline fuses, HV extension lead (mines missing), adapter sockets for various basesand CRT base extension cable (with this jig you could use an 8X on sets meant for an 8Y if you used the jigs yoke), a test speaker and audio output transformer....all in a nice carrying case.
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